Advice? Essential elements

I dose potassium, strontium, iron, and iodine once a week. Like Bud's said the potassium will cause problems and I have seen improvement with iron also. Not so much the others.
I do the Triton mail in testing a couple times a year to keep an eye on things. I do test the big 3 and potassium with my kits.

 

I know green corals use a lot of iron, so if your greens are starting to color up, it may be using it.

 

Most hobbyists never think about supplementing things beyond the basic ions of calcium and alkalinity and the occasional magnesium. Granted iron isn’t mandatory for keeping many marine animals, it is however important for coloration and pigment creation in stony corals. It is also extremely important in applications where refugiums and mass macroalgae is being cultivated. Iron provides an organic compounded which is readily available to both corals as well as macroalgae. Macroalgae will quickly strip valuable iron from a reef system and once depleted will begin to turn from a dark green to yellow. So for longevity of macroalgae iron is extremely important. Maintaining proper iron levels will increase the speed at which macroalgae grows, thus helping to transport nutrients from the reef aquarium for better usage by your macroalgae. It also decreases the likelihood of Caulerpa sp. undergoing sexual reproduction and causing explosions of nutrients in the water column. Iron also is used in photosynthesizing organisms (coral included) in the breakdown of CO2 into glucose.

Potassium(399ppm) provides the "last of the major ions" in natural seawater. Most hobbyists overlook the importance of potassium since it is not part of the skeletal growth compounds needed by stony corals. However it is just as important for proper balance as well. It is used for creating pigment in stony corals, especially in LPS (Large Polyp Stony) corals.

Having strontium levels found in natural seawater means more energy available for skeletal growth. Strontium is used by stony corals in the creation of new skeletal growth. Strontium is proven to increase bone density.

Manganese levels found in natural seawater means more energy available for skeletal growth and brings out the natural colors of your corals.

Testing these ion levels and, dosing these daily based upon what your reef uses is suggested. I hope this helps.

 

Several manufactures for strontium test such as Salifert, Red Sea, Seachem... Hach and Lamotte for Manganese.. Glad it helped

 

Consistent/set WC schedule is very helpful What will you be using the dosers for...big 3? Manually dosing until you find the correct dose for each has always worked well. Cuts swings and time for dialing them in. Then the dosers can be programmed accordingly. Many only use a doser for ALK and CA but it really is up to each person.

 

My experience with strontium is that most salt mixes I have tried and using the strontium test from Salifert, the test result was the same, 0-3ppm. It will take quite a bit of strontium to increase it, and again in my experience.

Others that dose strontium may have different experiences than me so hopefully others will chime in

 

Here is a good article on the colors and what elements affect them. THis works in alot of corals like chalices not just SPS

Guide of SPS coral coloration (make them more vivid, bright) News Reef Builders | The Reef and Marine Aquarium Blog